package com.sh4.util;


public class EmojiFilter {
    public static boolean containsEmoji(String source) {
        int len = source.length();
        boolean isEmoji = false;
        for (int i = 0; i < len; i++) {
            char hs = source.charAt(i);
            if (0xd800 <= hs && hs <= 0xdbff) {
                if (source.length() > 1) {
                    char ls = source.charAt(i + 1);
                    int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
                    if (0x1d000 <= uc && uc <= 0x1f77f) {
                        return true;
                    }
                }
            } else {
                // non surrogate
                if (0x2100 <= hs && hs <= 0x27ff && hs != 0x263b) {
                    return true;
                } else if (0x2B05 <= hs && hs <= 0x2b07) {
                    return true;
                } else if (0x2934 <= hs && hs <= 0x2935) {
                    return true;
                } else if (0x3297 <= hs && hs <= 0x3299) {
                    return true;
                } else if (hs == 0xa9 || hs == 0xae || hs == 0x303d
                        || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c
                        || hs == 0x2b1b || hs == 0x2b50 || hs == 0x231a) {
                    return true;
                }
                if (!isEmoji && source.length() > 1 && i < source.length() - 1) {
                    char ls = source.charAt(i + 1);
                    if (ls == 0x20e3) {
                        return true;
                    }
                }
            }
        }
        return isEmoji;
    }

    @SuppressWarnings("unused")
	private static boolean isEmojiCharacter(char codePoint) {
        return (codePoint == 0x0) || (codePoint == 0x9) || (codePoint == 0xA)
                || (codePoint == 0xD)
                || ((codePoint >= 0x20) && (codePoint <= 0xD7FF))
                || ((codePoint >= 0xE000) && (codePoint <= 0xFFFD))
                || ((codePoint >= 0x10000) && (codePoint <= 0x10FFFF));
    }
    /**
     * 将emoji表情替换成空串
     *  
     * @param source
     * @return 过滤后的字符串
     */
    public static String filterEmoji(String source) {
     if (source != null && source.length() > 0) {
      return source.replaceAll("[\ud800\udc00-\udbff\udfff\ud800-\udfff]", "");
     } else {
      return source;
     }
    }
//    /**
//     * 过滤emoji 或者 其他非文字类型的字符
//     * 
//     * @param source
//     * @return
//     */
//    public static String filterEmoji(String source) {
//        if (StringUtils.isBlank(source)) {
//            return source;
//        }
//        StringBuilder buf = null;
//        int len = source.length();
//        for (int i = 0; i < len; i++) {
//            char codePoint = source.charAt(i);
//            if (isEmojiCharacter(codePoint)) {
//                if (buf == null) {
//                    buf = new StringBuilder(source.length());
//                }
//                buf.append(codePoint);
//            }
//        }
//        if (buf == null) {
//            return source;
//        } else {
//            if (buf.length() == len) {
//                buf = null;
//                return source;
//            } else {
//                return buf.toString();
//            }
//        }
//    }
}
